Tickets to the 8:15 a.m. event at the home of Brent and Dana Jones start at $1,000; with "Club Mitt" members asked to pay $5,000. A $10,000 personal contribution wins entry to a photo reception with the Wisconsin congressman, and giving or raising that amount or more buys entry into a host committee reception.

Reporters won't be allowed into the event.

Brent Jones, the host of Saturday morning's event, played tight end for the San Francisco 49ers from 1987 to 1997, winning Super Bowl rings with the team in 1989, 1990 and 1995. He's now a managing director of Northgate Capital, where he oversees investments in companies including Palo Alto Networks, Solexel, Kovio, Aoptix Technologies, Clearwell Systems, AdMob and Meraki. He's on the boards of the Stanford Hospital Stroke Center and the San Jose Sharks. He's been rumored as a congressional candidate a few times in recent years, but has never run for public office.

Saturday morning's proceeds will flow through Romney Victory Inc., a joint fundraising committee, to the Romney campaign, the Republican National Committee, the National Republican Senatorial Committee and the National Republican Congressional Committee.

Ryan on Saturday afternoon will visit Google's headquarters in Mountain View, from where he'll do an online "hangout" with campaign offices in Nevada, Wisconsin, Virginia and Florida; later Saturday, he has a fundraising dinner scheduled at the Fresno Convention Center's Valdez Hall. He attended private campaign events Thursday in Los Angeles, and a public rally Friday in Sparks, Nev.

California Democrats, including Rep. John Garamendi, D-Fairfield, and state Sen. Michael Rubio, D-Bakersfield, blasted Ryan's visit in a conference call with reporters Friday.

"I'm a bit puzzled at the fact that Mr. Ryan would visit Obama country when, on the heels of that great convention, we're more fired up and more ready to go than ever in recent memory," Rubio said. "For him to come here to California and use it as an ATM machine and not respond to the needs of the Central Valley, I find it very insulting."

Rubio, who has run several Ironman triathalons, challenged Ryan, who has spoken of his mountaineering and marathon skills, to an athletic contest of Ryan's choosing. Rubio said if Ryan wins, he'll give the maximum contribution to the Romney-Ryan campaign, but if Rubio wins, Ryan will have to restore the money his budget would cut from the nation's neediest.